EP1202092A1 - Réseau de fibre optique, procédé de son fabrication et dispositif utilisant le réseau de fibre optique - Google Patents

Réseau de fibre optique, procédé de son fabrication et dispositif utilisant le réseau de fibre optique Download PDF

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Publication number
EP1202092A1
EP1202092A1 EP01308811A EP01308811A EP1202092A1 EP 1202092 A1 EP1202092 A1 EP 1202092A1 EP 01308811 A EP01308811 A EP 01308811A EP 01308811 A EP01308811 A EP 01308811A EP 1202092 A1 EP1202092 A1 EP 1202092A1
Authority
EP
European Patent Office
Prior art keywords
face
fiber
adhesive
fiber array
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01308811A
Other languages
German (de)
English (en)
Inventor
Akira Matsumoto
Masashi Fukuyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP1202092A1 publication Critical patent/EP1202092A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
    • G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/40—Mechanical coupling means having fibre bundle mating means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/30—Optical coupling means for use between fibre and thin-film device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3648—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures
    • G02B6/3652—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3855—Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
    • G02B6/3861—Adhesive bonding

Definitions

  • the present invention relates to fiber arrays used to fix one or more optical fibers in a line, and connect the one or more optical fibers to an optical element, as well as to methods for fabricating such fiber arrays and optical devices using such fiber arrays.
  • Fig. 3(a), the corresponding lateral view 3(b), and in Fig. 4 the end faces of a fiber array F and a waveguide substrate are optically fixed by an end face adhesive A, and the end faces of the optical fibers are up to about 10 ⁇ m removed from the end face of the wave guide D.
  • Fig. 4(a), which is a front view, and in Fig. 4(c), which is a cross-section taken from above stripped fibers 8 are placed in a V-groove substrate 1, and a fiber fixing substrate 2 fixes the stripped fibers 8 in the center of the V-grooves.
  • the stripped fibers 8 are fastened by a peripheral adhesive B disposed around the stripped fibers 8, so that the gap between the V-grooves and the stripped fibers 8, in other words the periphery of the fibers, is filled with the peripheral adhesive B. Furthermore, coated fibers 9 are housed by an upper substrate 3, to which they are fixed with an adhesive. It should be noted that the upper substrate 3 is sometimes not needed, since the fiber fixing substrate 2 is used to fix the stripped fibers 8 securely in the center of the V-grooves 7.
  • the V-groove substrate 1 includes an upper plane 4 and a lower plane 6 that is recessed by a step 5 from the upper plane 4.
  • V-grooves 7 are formed by mechanical machining using a grinding stone or the like, or by Si etching to house the stripped fibers 8 in the upper plane 4.
  • the height of the step 5 is set to about half the diameter of the coated portion of the optical fiber. This height is adjusted such that the stripped fibers 8 are placed in the center of the V-grooves 7, when the coating of the optical fibers is put on the lower plane 6.
  • the fiber fixing substrate 2 is fastened tightly to the upper side of the upper plane 4 to fix the stripped fibers 8 in the center of the V-grooves 7.
  • grooves are formed in the lower side of the upper substrate 3, and the upper substrate 3 is placed on the lower plane 6 of the V-groove substrate 1.
  • the upper substrate 3 is placed on the lower plane 6 of a V-groove substrate 1, and the end face of the upper substrate 3 is adhered tightly to the step 5 of the V-groove substrate 1.
  • both parts are positioned with respect to longitudinal direction.
  • tunnel-shaped holes are formed by the lower plane 6 and the grooves in the lower surface of the upper substrate 3.
  • the stripped optical fibers 8 are matched with the centers of the V-grooves 7.
  • the coating housing portion is machined so that the grooves in the lower surface precisely match the coating of the fibers. Consequently, once the optical fibers are inserted, they are maintained in that state.
  • a thermo-setting or UV-setting resin adhesive B is injected and filled around the stripped fibers 8 to fix them adhesively.
  • both end faces of the fiber array F and the waveguide D substrate are optically fixed with the end face adhesive A.
  • the peripheral adhesive B swells and its volume expands when the adhesive B is disposed around the fibers in the fiber array. If it protrudes out to the front, pressing against the end face adhesive A as shown in Fig. 4(c), a strong exfoliation stress acts on the adhesion interface between the end face adhesive A and the fiber end faces. It may lead to exfoliations 8b. More specifically, as shown in Fig. 4(b), the spaces for the fibers have the shape of triangular prisms. The peripheral adhesive B around the fibers protrudes from the portions corresponding to the three vertices in longitudinal direction while enclosing the fibers.
  • a fiber array housing 48 fibers was produced, which had a total longitudinal length of 12 mm, and in which the length of the distance over which the fibers were fixed in the V-grooves was 4 mm.
  • an epoxy adhesive was selected that had a curing shrinkage ratio of 2%, a water absorption ratio of 0.5%, a thermal expansion coefficient of 1 ⁇ 10 -4 , and a Shore D85 hardness.
  • a fiber array houses a stripped fiber in a V-groove of a V-groove substrate.
  • the stripped fiber is fixed in the V-groove by a fiber fixing substrate, and is adhered by a peripheral adhesive B disposed around the stripped fiber.
  • An end face of the peripheral adhesive B is recessed with respect to an end faces of the fiber.
  • x refers to a recess depth that the end face of the peripheral adhesive B is recessed with respect to the end face of the fiber.
  • L refers to the length over which the optical fibers are adhered to the V-grooves.
  • water absorption ratio ⁇ means the ratio of volume increase.
  • a recess depth x is at least 0.1 ⁇ m.
  • the end face of the fiber is flush with the end face of the fiber array or protrude therefrom.
  • the end face of the fiber is not recessed with respect to the end face of the fiber array, so that dirt can be easily removed from the fiber end faces by washing before the adhesion to the waveguide. Consequently, the risk of problems such as poor adhesion forces, light reflections and losses can be eliminated.
  • the end face of the peripheral adhesive B is recessed at most 10 ⁇ m with respect to the end faces of the fibers.
  • impurities such as grinding stone grains or other dirt, can be removed by rinsing the end face of the fiber array or scraping the impurities out. These impurities usually enter the recesses during polishing. Thus, there is no risk of poor adhesion, light reflections, or other losses, which occurs when the adhesion to the waveguide is performed while impurities still stick to the end face of the adhesive.
  • the peripheral adhesive B has a Young's modulus of at least 0.03GPa.
  • the fiber can be securely fixed without positional shifts even when using one of the usual epoxy adhesives but with high Young's modulus.
  • a method for fabricating a fiber array in which the end face of the peripheral adhesive B is recessed with respect to end faces of the fibers includes ashing or etching steps. After polishing an end face of the assembled fiber array, ashing or etching the end face are taken at which the end of the peripheral adhesive B and the end face of the fiber are located.
  • the peripheral adhesive B can be oxidized away to form recess portions. In particular, if this is done immediately before coupling with the waveguides of the optical device, the recess portions are formed in the peripheral adhesive B at the same time it eliminates organic material on the adhesion surface. It improves the adhesion strength of the end face adhesive A bonding optical elements such as waveguides to the fiber array.
  • an optical device is optically connected/fixed to a fiber end face of a fiber array with the end face adhesive A.
  • optical devices include optical waveguides, diodes, lenses, isolators, all types of bulk filters, as well as polarizers.
  • Fig. 1 shows a first embodiment of the present invention in a partial magnification similar to that of Fig. 4.
  • Stripped fibers 8 are placed and positioned in V-grooves 7 provided in a V-groove substrate 1, and are fixed by a peripheral adhesive B.
  • Fig. 1(a) is a cross-sectional view taken from above, showing the initial adhesion state.
  • the stripped fibers are positioned such that they protrude beyond the end face 1a of the V-groove substrate 1, and the adhesive B is formed flush with the end face 1a of the V-groove substrate 1 and does not protrude beyond that end face 1a.
  • the adhesive B swells and extends in the longitudinal direction subjected to high temperature and high humidity, it protrudes beyond the end face 1a of the V-groove substrate and out from the end face of the fiber array, as shown in Fig. 1(b).
  • the tip of the adhesive does not go beyond the tips of the stripped fibers.
  • the adhesive does not apply a stress that might lead to exfoliation on the junction face of the end face adhesive A.
  • Fig. 2 shows a second embodiment of the present invention in a cross section taken from above, similar to Fig. 1. While the optical fibers in the fiber array in Fig. 1 protrude from the fiber array, the optical fibers in the fiber array in Fig. 2, are formed flush with the fiber array.
  • the adhesive B forms a meniscus surface with respect to the gaps around the fibers, and the vicinity of the center of the meniscus surface is receded at least 0.1 ⁇ m and at most 10 ⁇ m from the fiber end face.
  • the adhesive B swells and extends in the longitudinal direction, and protrudes in outward direction from the initial state, as shown in Fig. 2(b).
  • the tip of the adhesive B does not swell beyond the end face of the stripped fibers and the end face 1a of the V-groove substrate 1. As a result, it does not apply a stress that might lead to exfoliation on the junction face with the adhesive A.
  • the end face of the fiber array fastened to the waveguide is ashed or plasma etched in a polishing step, which is the last step for fiber arrays assembled in an ordinary fabrication process.
  • the peripheral adhesive B can be oxidized away to form recess portions.
  • the recess portions are formed in the peripheral adhesive B at the same time of eliminating organic material from the adhesion surface. This improves the adhesion strength of the end face adhesive A bonding optical elements such as waveguides to the fiber array.
  • Fiber arrays accommodating 48 fibers were produced, which had a total longitudinal length of 12 mm, and in which the length of the distance over which the fibers were fixed in the V-grooves was 4 mm.
  • an epoxy adhesive was selected that had a curing shrinkage ratio of 2%, a water absorption ratio of 0.5%, a thermal expansion coefficient of 1 ⁇ 10 -4 , and a Shore D85 hardness. The previously mentioned method was used to form the recesses, and samples with different recess depth were produced, and when they were subjected to an accelerated aging test of 85°C/85%RH ⁇ 2 weeks, the following test results were obtained.
  • the recess depth is at least 0.1 ⁇ m and at most 10 ⁇ m.
  • the recess depth is at least 0.1 ⁇ m, even when the volume of the peripheral adhesive B increases due to aging, the end of the swelled adhesive does not stick out from fiber end faces, so that it does not push against the end face adhesive A.
  • the recess depth is not more than 10 ⁇ m, then impurities can be removed by rinsing the end face of the fiber array or scraping. Thus, there is no risk of poor adhesion, light reflections, or other losses, which occurs when the adhesion to the waveguide is performed while impurities still stick to the end face of the adhesive.
  • a relation x f ( ⁇ , L) can be established. From this relation, a suitable recess depth can be formed, adjusted for the adhesion length, with the desired peripheral adhesive, thus providing a fiber array with a coupling force resistant to aging.
  • stripped fibers are housed in V-grooves of a V-groove substrate and are fixed in the V-grooves by a fiber fixing substrate.
  • the fibers are fastened by a peripheral adhesive B that is disposed around the fibers, and the end of the peripheral adhesive B is recessed with respect to an end face of the fibers.
  • the end face of the peripheral adhesive B does not protrude from the fiber end faces. This leads to deformation stress that loosens the entire adhesive interface or local exfoliation of the fiber end faces as in the related art, and the risk of light reflections is eliminated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Optical Couplings Of Light Guides (AREA)
EP01308811A 2000-10-17 2001-10-16 Réseau de fibre optique, procédé de son fabrication et dispositif utilisant le réseau de fibre optique Withdrawn EP1202092A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000316970 2000-10-17
JP2000316970 2000-10-17
JP2001258465 2001-08-28
JP2001258465A JP2002196179A (ja) 2000-10-17 2001-08-28 ファイバアレイ及びその製造方法並びにファイバアレイを用いた光デバイス

Publications (1)

Publication Number Publication Date
EP1202092A1 true EP1202092A1 (fr) 2002-05-02

Family

ID=26602253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01308811A Withdrawn EP1202092A1 (fr) 2000-10-17 2001-10-16 Réseau de fibre optique, procédé de son fabrication et dispositif utilisant le réseau de fibre optique

Country Status (6)

Country Link
US (1) US6798969B2 (fr)
EP (1) EP1202092A1 (fr)
JP (1) JP2002196179A (fr)
KR (1) KR20020032306A (fr)
CN (1) CN1265222C (fr)
TW (1) TWI244561B (fr)

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JP2008151843A (ja) * 2006-12-14 2008-07-03 Omron Corp 光伝送用光学部品及びその製造方法
TWI497142B (zh) * 2011-01-26 2015-08-21 Hon Hai Prec Ind Co Ltd 光纖連接器
WO2016143044A1 (fr) * 2015-03-09 2016-09-15 オリンパス株式会社 Structure de retenue de fibre optique, module de transmission optique, et procédé de fabrication de structure de retenue de fibre optique
US9348094B1 (en) * 2015-03-21 2016-05-24 Skorpios Technologies, Inc. Axial alignment of a lensed fiber in a silica v-groove
US11573377B2 (en) * 2015-10-12 2023-02-07 3M Innovative Properties Company Optical waveguide positioning feature in a multiple waveguides connector
JP6927094B2 (ja) * 2018-03-09 2021-08-25 日本電信電話株式会社 光導波路接続構造
CN109799587A (zh) * 2018-11-22 2019-05-24 深圳阿珂法先进科技有限公司 一种对裸光纤或光器件进行临时或永久固定的方法
JP7521458B2 (ja) * 2021-03-04 2024-07-24 住友電気工業株式会社 光コネクタケーブル
CN113416006B (zh) * 2021-06-10 2023-04-11 西湖大学 一种光纤端面集成微纳结构的加工方法

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WO1990004194A1 (fr) * 1988-10-07 1990-04-19 Eastman Kodak Company Reseau de fibres optiques
EP0574734A1 (fr) * 1992-06-19 1993-12-22 Corning Incorporated Composant optique connecté à un réseau de fibre optique
EP0626600A1 (fr) * 1993-05-26 1994-11-30 Sumitomo Electric Industries, Limited Module à guides d'ondes optiques et procédé pour sa fabrication
JPH07174944A (ja) * 1993-12-20 1995-07-14 Nec Corp 光送受信装置
EP0729044A2 (fr) * 1995-02-21 1996-08-28 Ngk Insulators, Ltd. Substrat de fixation pour fibre optique, son procédé de fabrication et dispositif optique
JPH10197755A (ja) * 1997-01-13 1998-07-31 Sumitomo Electric Ind Ltd 光導波路モジュール及びその製造方法
EP0943942A2 (fr) * 1998-03-20 1999-09-22 Ngk Insulators, Ltd. Arrangement de fibres optiques

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GB2151040A (en) * 1983-12-07 1985-07-10 Bicc Plc Optical fibre splice
WO1990004194A1 (fr) * 1988-10-07 1990-04-19 Eastman Kodak Company Reseau de fibres optiques
EP0574734A1 (fr) * 1992-06-19 1993-12-22 Corning Incorporated Composant optique connecté à un réseau de fibre optique
EP0626600A1 (fr) * 1993-05-26 1994-11-30 Sumitomo Electric Industries, Limited Module à guides d'ondes optiques et procédé pour sa fabrication
JPH07174944A (ja) * 1993-12-20 1995-07-14 Nec Corp 光送受信装置
EP0729044A2 (fr) * 1995-02-21 1996-08-28 Ngk Insulators, Ltd. Substrat de fixation pour fibre optique, son procédé de fabrication et dispositif optique
JPH10197755A (ja) * 1997-01-13 1998-07-31 Sumitomo Electric Ind Ltd 光導波路モジュール及びその製造方法
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Also Published As

Publication number Publication date
CN1357771A (zh) 2002-07-10
US20020085826A1 (en) 2002-07-04
TWI244561B (en) 2005-12-01
CN1265222C (zh) 2006-07-19
KR20020032306A (ko) 2002-05-03
JP2002196179A (ja) 2002-07-10
US6798969B2 (en) 2004-09-28

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